Find the phase velocity of the wave (Plasma Physics)

1. The problem statement, all variables and given/known data
An electromagnetic wave with the frequency f = 1.4 GHz is propagating in the z-direction from vacuum in a plasma with the magnetic field B_0 = 0.1T z^. The plasma density is 1.0*10^17 particles/m^3. The wave is the seperated into a R- and L-wave in the plasma.

1. The problem statement, all variables and given/known data
An electromagnetic wave with the frequency f = 1.4 GHz is propagating in the z-direction from vacuum in a plasma with the magnetic field ## B_0 = 0.1T \hat z ##. The plasma density is ## 1.0*10^{17} ## ## \frac {particles} {m^3} ##. The wave is then separated into a R- and L-wave in the plasma.